Taylor Swift and Calvin Harris's relationship reportedly reached "breaking point" after he failed to acknowledge her input on his hit song 'This Is What You Came For'.

The 26-year-old singer's involvement in Calvin and Rihanna's recent hit has long been rumoured, after she was listed as a co-writer on the Wikipedia entry for the track before the entry was changed to Nils Sjoberg - believed to be Taylor's pseudonym.

It’s no secret that they know how to make beautiful music together, and on Monday (July 4) Taylor Swift and Ed Sheeran showed off their cover band chops with an impromptu rendition of “Baby One More Time.”